Multiple choice

The average of two numbers is 8 and that of another three numbers is 3. The average of these five numbers is

  1. 7

  2. 5.5

  3. 6

  4. 5

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D Correct answer
Explanation

Sum of first two = 2 * 8 = 16. Sum of next three = 3 * 3 = 9. Total sum = 16 + 9 = 25. Average of five = 25 / 5 = 5.

AI explanation

Using the weighted average formula, the sum of the first two numbers is 2 times 8, which equals 16, and the sum of the other three numbers is 3 times 3, which equals 9. The total sum of all five numbers is 16 plus 9, giving 25. Dividing this total sum by 5 yields an overall average of 5.